OK and excellent. The contour HD was sometimes screwy with sound, well just weak, not so much distorted or scratchy but muffled (of course is was exposed to gunfire) Its problem was the door opening under recoil.
The new ones HD w/ GPS have better codecs so the sound is great and they added a lock to the battery door. The GPS model resolved all issues the HD had.
Will see what videos I can post from work tomorrow, most have military personnel and will not be openly posted. I can helmet mount one and run around the shop or something. Some live action reloading or barrel fitting
I have the Go Pro, non Hd version, though I greatly want the HD. I've been quite happy with it, though I don''t have any recent video's shot with it. Should do some editing. This video is one I took a while back. racing the Pugsley in a muddy race. band is House Of Large Sizes.